Xcode 27: compila sin warnings y migra API deprecadas de SwiftUI

- Imports de CoreData que faltaban (MemberImportVisibility) en AccountsView,
  ImportDataView, ChartsContainerView y AddSourceView.
- Aislamiento MainActor: IsolatedDefaultValues en el target de la app,
  LinearGradient @MainActor, WatchSyncMessage nonisolated, closures de
  ReviewPromptService/MonthlyCheckInStore/AppIntents.
- Warnings de valores sin usar (SnapshotGapDetector, DashboardLayoutStore,
  OnboardingView, GoalEditorView, CoreDataStack, SettingsViewModel).
- foregroundColor→foregroundStyle, cornerRadius→clipShape,
  navigationBarLeading/Trailing→topBarLeading/Trailing,
  Task.sleep(nanoseconds:)→sleep(for:), NavigationLink(isActive:)→
  navigationDestination(isPresented:).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F1u4K16xy7eQVtgsYNZ9Vn

PortfolioJournal/Services/ChartShareService.swift

@@ -124,7 +124,7 @@ struct ChartShareCardView<Content: View>: View {
                         .font(.headline)
                     Text("\(title) · \(Self.dateLabel)")
                         .font(.subheadline)
-                        .foregroundColor(.secondary)
+                        .foregroundStyle(.secondary)
                 }
                 Spacer()
             }
@@ -138,15 +138,15 @@ struct ChartShareCardView<Content: View>: View {
                         VStack(alignment: .leading, spacing: 3) {
                             Text(stats[i].label)
                                 .font(.caption2)
-                                .foregroundColor(.secondary)
+                                .foregroundStyle(.secondary)
                             Text(stats[i].value)
                                 .font(.subheadline.weight(.semibold))
-                                .foregroundColor(stats[i].color)
+                                .foregroundStyle(stats[i].color)
                         }
                         .padding(.horizontal, 12)
                         .padding(.vertical, 8)
                         .background(Color(.systemGray6))
-                        .cornerRadius(8)
+                        .clipShape(RoundedRectangle(cornerRadius: 8))
                     }
                     Spacer()
                 }
@@ -161,7 +161,7 @@ struct ChartShareCardView<Content: View>: View {
                         .font(.footnote.weight(.medium))
                     Text(verbatim: "portfoliojournal.app")
                         .font(.footnote)
-                        .foregroundColor(.appPrimary)
+                        .foregroundStyle(Color.appPrimary)
                 }
                 Spacer()
                 if let qrCodeImage {
@@ -173,7 +173,7 @@ struct ChartShareCardView<Content: View>: View {
                             .frame(width: 64, height: 64)
                         Text(String(localized: "chart_share_scan"))
                             .font(.caption2)
-                            .foregroundColor(.secondary)
+                            .foregroundStyle(.secondary)
                     }
                 }
             }